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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted

	Three Months Ended June 30,					Six Months Ended June 30,
Numerators:	2012		2011			2012		2011
Numerator for both basic and diluted EPS, net income	$	40,766,539	$	38,472,169		$	87,111,123	$	80,805,051
Denominators:
Denominator for basic EPS, weighted-average shares outstanding		143,722,329		142,279,210			143,610,898		142,071,203
Potentially dilutive shares resulting from stock plans		1,019,028		1,917,784			1,243,334		1,992,412
Denominator for diluted EPS		144,741,357		144,196,994			144,854,232		144,063,615
Shares related to stock plans not included in diluted average common shares outstanding because their effect would be anti-dilutive		3,513,682		1,078,512			2,906,932		307,231

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- Definition

Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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